Weighing scale poise



Jan. l5, 1952 H. w; HEM

WEIGHING SCALE POISE 2 SlIEETS-SHEET l Filed March 23, 1946 l l WINVENTOR. /d/Vof' W Hem BY @22M TToBNEg Patented Jan. 15, 1952 WEIGHINGSCALE POISE Halvor W. Hem, Toledo, Ohio, assignor to Toledo ScaleCompany, Toledo, Ohio, a corporation of New Jersey Application March 23,1946, Serial No. 656,726

This invention relates to weighing scales and in particular to animproved poise for use on the weigh beam of a weighing scale.

It is common practice in the construction of high-capacity beam scalesto use a heavy poise and to mount the poise on rollers so that it mayeasily be moved along the beam. It is customary to construct weighingscale poises of two parts, the division between the parts being along avertical plane extending through the beam. These poises, when assembled,completely encircle the beam so that they may not be removed or easilyaltered in weight. When rollers are employed in such a poise each halfof the poise journals one end of each roller axle. In order that thepoise may roll easily the axles must be exactly parallel to each otheras well as being exactly perpendicular to the plane dividing the partsof the poise. Any deviations from these precise conditions cause therollers to crowd toward one side of the beam or the other and tointroduce binding and friction as the poise is moved along the beam. Inorder that the roller axles be precisely perpendicular to the planedividing the poise, the two portions of the poise must be machined toexact dimensions and be assembled in exact registry. These exactingrequirements make the poise diflicult and expensive to build.

The object of this invention is to provide an improved poise in whichall of the rollers are journaled in one member.

Another object of the invention is to provide a poise having a frame onwhich rollers are mounted and to which weighted shells are attached.

More specific objects and advantages are apparent from the followingdescription in which reference is made to the accompanying drawings.

'I'he objects of the invention are attained by providing a generallyflat plate with axles protruding from one side and journaling supportingrollers and also having other rollers journaled on axles parallel to theplane of the plate for guiding the plate along a Weigh beam. A pair ofweighted shells are provided which may be attached to opposite sides ofthe plate to enclose the rollers and to provide the required mass forthe poise. Inasmuch as all of the axles or journaling means for therollers are permanently xed to the plate they cannot become derangedduring the assembly of the poise onto the Weigh beam. Furthermore, theaxles may be set in the plate during the machining of the plate andduring which time the requisite accuracy is easily maintained.

3 Claims. (Cl. 265-565) An improved poise constructed according to theinvention is illustrated in the accompanying drawings.

In the drawings:

Figure I is a front elevation of a portion of a weigh beam having theimproved poise mounted thereon.

Figure II is a vertical section of the improved poise as seen from theline II-II of Figure I.

Figure III is a horizontal section of the poise taken along the lineIII-III of Figure II.

Figure IV is a vertical section of the improved poise taken along theline IV-IV of Figure II.

FigureV is a vertical section taken along the line V-V of Figure II.

Figure VI is a fragmentary end elevation of the poise with the weighbeam shown in section.

These specific gures and the accompanying description are intendedmerely to illustrate the improved poise but not to impose limitations onthe claims.

In a weighing scale incorporating the invention loads to be weighed areplaced on a platform and the load forces are transmitted through a leversystem which terminates in a steelyard rod I suspended from a stirrup 2having bearing blocks 3 pivotally supported on a load pivot 4 for aweigh beam lever 5. The weigh beam lever 5 is rockably mounted on afulcrum pivot 6 which rests in V-bearings 'I forming the upper part of afulcrum stand 8 erected from a beam shelf 9. The weigh beam lever 5 hasa main beam III and an auxiliary or tare beam II. The main beam I0 has anotched bar I2 set into its upper surface, graduated indicia bearingplates I3 attached to its sides and a roller track I4 formed in itsupper surface adjacent the notched bar I2. The auxiliary or tare beam IIhas a main tare poise I5 which is slidable along the tare beam I I andis located by notches I6 cut into the upper surface of the beam. Afractional tare poise I1 is slidable along a portion of the tare beam IIand has a total weighing capacity equal to the incremental weighingcapacity represented by the space between the notches I6.

The main beam I0 is provided with a main poise I8 which is movabletherealong and which is positioned by engaging a latch I9 into thenotches of the notched bar I2. A U-shaped bracket 20 attached to the topof the main poise I8 carries a fractional beam 2| with its poise 22. Thecapacity of the fractional beam 2l is equal to the incremental capacityrepresented by the spacing of the notches in the notched bar I2.

The beam is brought into balance at no load and with all the poises setat zero by adjustment of a balance Weight 23 which is slidable alongrods 24 and 25 mounted in brackets E@ attached to and extending upwardlyfrom the beam lever 5. When the initial pull of the load receiver'supporting lever system is insuiicient to bring the beam into balanceWithin the range of adjustment of the counterweight 23 additionalweights may be hung from a stirrup 2l pivotally suspended from a knifeedge 28 set in the tail end of the beam lever 5.

The poise i8 comprises a front shell 29 and a rear shell 3i? secured toopposite sides of a fla-t plate 3l. A pair of axles 32 having integrallyformed flanges 33 are riveted or otherwise secured into the upperportion of the plate so as to project to one side thereof. rilhe axles-32 journal rollers 36 adapted to roll on the track i4 and to supportthe weight of the poise I8. Because the plate 3| is flat and the axles32 have the integral flanges 33 formed thereon by a turning operationthe axles when riveted in place are precisely parallel to each other andperpendicular to the plane of the plate 3l. The rollers Se willtherefore roll along the track lil Without any tendency to run oif ineither direction. The rollers Sli are held in place on the axles 32 bynuts 35 threaded onto the ends of the axles.

A. three-legged axle frame or spider 36 is attached to the back side ofthe plate 3l, a pair oi machine screws 3l' with nuts Sii serving to holdit in place. The axle spider 36 has an upwardly extending arm 39 onwhich is journaled a roller 4t. A rectangular opening di is cut throughthe plate 3l so that the periphery of the roller lll may protrudetherethrough to contact the side of the main beam le adjacent its uppersurface. A pair of laterally spaced depending arms 42 of the spidercarry rollers i3 which extending through rectangular slots (it contactJthe side of the main beam it adjacent its lower surface.

The rollers d@ and 43 provide three spaced points of support for guidingthe plate Si along the main beam iii, while the rollers 34 carry theWeight of the plate and the shells 29 and Sil. The arm 39 and the twoarms d2, being integral parts of the axle spider t6 may be machined sothat the journals for the rollers lill and /l'l are precisely parallel.Since the axles 32 are also precisely parallel optimum conditions forlow friction are maintained regardless of the alignment of the shells2li and 3G. |lhe shells 25 and 3S are attached to the plate by fourbolts i5 which extend through drilled holes in the poise shell 3Q,through holes in the plate 3l and are threaded into tapped holes in theshell 29. If desired, for convenience in assembling, dowel pins 135 maybe employed to locate the shell with respect to the plate.

The latch l@ forms the tip of a latch lever lil' having a handle portiond8 extending from the opposite end of the poise from the latch i S. Thelatch lever di is carried on a stud Il@ which is riveted into the plate3l and extends to the same side of the plate as the axles 32 and abovethe line of centers of the axles 32. The latch lever 41 is provided witha spring 5E which resting against a pin l threaded into the plate 3lurges the handle i8 upwardly and the latch i9 into rm engagement withthe notches in the notched bar l2.

Pockets 52 and 53 in the shells 29 and 30 are partially filled with leador other ballast material to adjust the Weight of the poise.

The poise has C-shaped indicia viewing openings 54 and 55 formed in theshells 29 and 30 respectively (see Figure VU. The G-shaped opening 54 isformed completely within the shell t' and includes an index 5B adaptedto cooperate with the indicia on the graduated bar I3. The plate 3|,which is located on the back side of the beam as viewed in Figure l',has a C-shaped opening 5l including an index portion 58. The peripheryof the C-shaped opening 51 is beveled to correspond to the generalcontour of the viewing opening 54 insofar as the thickness of the plate3l will permit. The C-shaped opening 55 in the shell 39 is slightlygreater than the opening 5l in the plate 3l and is beveled so that theopening 55 and the opening 5l' taken together approximate the shape ofthe viewing opening 5d. The adjoining edges of the openings 55 and 5l'in the shell 3! in the plate 3l respectively do not register exactly,the opening 5l being the smaller so that considerable error inpositioning the shell 3i) on the plate 3l will not produce an unsightlyappearance in the viewing opening.

The improved poise is easily manufactured and provides exceptional easein operation. it may be assembled and disassembled repeatedly, as isoften required in adjusting a scale, without in anyway affecting thealignment of the roller axes or otherwise increasing the frictionresisting motion of the poise along the beam.

The specific construction illustrated in the drawing may be modiiied asrequired without departing from the scope of the invention.

Having described the invention, I claim:

l. A poise for use on a Weigh beam, the poise comprising a plate servingas a chassis for the poise, a plurality of axles each having one endrigidly attached to the plate and extending from a face of the plate, abracket attached t0 the plate, a plurality of axles each having an endsupported by the bracket and extending parallel to a face of the plate,each of the axles having free end, a roller mounted on the free end ofeach axle, said axles being arranged so that the rollers may support theplate from the weigh beam, and a weighted shell attached to the plateand serving as a housing.

2. A poise for use on a weigh beam, the poise comprising a plate servingas a chassis for the poise, a pair of axles rigidly mounted in the plateend extending generally perpendicular to the sides of the plate, bracketmounted on the side of the plate opposite the axles, a plurality ofaxles extending from the bracket and parallel to the side of the plate,said plate having apertures adjacent each of the bracket axles, each ofthe axles having a free end, rollers mounted on each of the free endssome of which rollers protrude through the apertures, said axles beingarranged so that the rollers may support the poise from the weigh beam,and'weighted shells for covering the sides of the plate and the rollers.

3. A poise for a weigh beam, the poise comprising a plate serving as achassis for the poise, a pair of axles rigidly mounted in the plate andextending generally perpendicular to the side of the plate, a pair ofrollers one jcurnaled on the free end of each of the rigidly mountedaxles, said'axles being located so that the rollers may engage a trackon the top of the weigh beam, a bracket on the side of the plateopposite the axles, a plurality of axles carried on the bracket andextending parallel to the side of the plate, rollers journaled on 'thefree ends of the axles, said plate having apertures to receive the lastmentioned rollers, the bracket and rollers being arranged such that therollers may engage a 5 side face of the weigh beam. and weighted coversUNITED STATES PATENTS that are attached to the plate and that serve toNumber Name Date house the rollers 1,049,535 Roseneld Jan. 7, 1913HALVOR' W- HEM 1,094,722 xmzz Apr. 2s, 1914 1,869,357 Fuller Aug. 2,1942 REFERENCES CITED 2,321,717 Wallace June 15, 1943 The followingreferences are ot record 1n the le of this patent.:

